Case and 
Column of 
Drawers. 

case 
G 
Go 
Go 


Reference to McCoy's 
Synopsis : and Figures of Genera. 
UPPER BALA GROUP. 
~I 
Or 


Names and References ; Observations, &c. 
Numbers and Localities. 

Pl. 1 8, fig. 26, p. 40. 

Pl. 1 8, fig. 26 6, p. 41. 
PI. 1 B, fig. 25, p. 41. 
p. 40. 
Pits: 
5! = 
p. 40. 
do. 
do. 
Pl. 1 8, fig. 25, p. 41. 
p. 40. 
fig. 23, p. 39. 
———— 
Petraia subduplicata, McCoy. A 
very common form, of which the 
next variety is the more frequent 
form. The main lamelle and 
the intermediate ones are nearly 
of the same size, at least near 
the edge of the cup. 

Petraia subduplicata, var. crenu- 
lata, McCoy. This is the com- 
mon Llandovery variety. 
Petraia uniserialis, McCoy. Small 
specimens and probably young. 
Petraia elongata. 
pl. 38, fig. 6.) 
(Siluria, 3rd ed. 
Petraia squisulecata, McCoy. A 
large species. 
Petraia rugosa, Phillips (Pal. Foss, 
Corn. & Devon, pl. 2, fig. 7). A 
species with very wide cup. 
Petraia, sp. 
Petraia, sp. 
Petraia uniserialis. See above. 
Petraia rugosa, Phill. See above. 
(Phil. Pal. Foss. pl. 2, fig. 7). 
Omphyma, Milne Edwards. Large 
simple cup-corals with four deep 
pits in the base of the cup. 




Llandovery Group. 
Upper Bala proper. 


a. 201, Dalquorrhan, 
Girvan (abundant). 
On the same tablet 
are two Middle Bala 
species for compari- 
son (p. 43); a. 201*, 
Haverfordwest, large 
size (J. W. S. 1863). 
a, 202, equally com- 
mon with the above 
at both localities, and 
wherever the Llando- 
very rocks are known; 
Mathyrafal; plentiful 
at Haverfordwest. 
Penlan, Llandovery. 
One of the best locali- 
ties for May HillSand- 
stone—in an arena- 
ceous and shaly form. 
a. 202*, Bala; locality 
doubtful; probably 
from these beds. 
Jo Wiss 
a. 203*, Mullock, Gir- 
van; Braes, Girvan. 
Llandovery. 
Dalquorrhan, Mullock. 
Mathyrafal, Meifod, 
a. 203, Llansant- 
fraid, Glyn Ceiriog ; 
a. 204, Penarth, 
(same tablet with 
last, perhaps Middle 
Bala); Meifod. 
10— 
bo 
